Engineering Materials Practice Set-8

Page 1 of 4

1. Cupola produces following material

Pig iron

Wrought iron

Malleable iron

Cast iron

2. Chromium in steel

Improves wear resistance, cutting ability and toughness

Gives ductility, toughness, tensile strength and anti-corrosion properties

Improves cutting ability and reduces hardenability

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

3. Compressive strength of grey cast iron in tonnes/cm is of the order of

35

1015

710

57

4. Which of the following is the binding material in cemented carbides?

Cobalt

Vanadium

Iron

Nickel

5. Permalloy is a

Polymer

Kind of stainless steel

None ferrous alloy

Nickel and iron alloy having high permeability

6. The alloying element which reduces the formation of iron sulphide in steel is

Vanadium

Manganese

Chromium

Nickel

7. Tungsten in high speed steel provides

Hot hardness

Toughness

Wear resistance

Sharp cutting edge

8. The hardness of steel increases if it contains

Martensite

Pearlite

Cementite

Austenite

9. Weld decay is the phenomenon found with

Nonferrous materials

Cast iron

Mild steel

Stainless steel

10. High carbon steel carries carbon percentage

0.1 to 0.3%

0.8 to 1.5%

0.3 to 0.6%

0.6 to 0.8%

Page 2 of 4

11. Bronze contains

70% copper and 30% zinc

90% copper and 10% tin

85 - 92% copper and rest tin with little lead and nickel

70 - 75% copper and rest tin

12. Gun metal contains

70 - 78% copper and rest tin

70% copper and 30% zinc

90% copper and 10% tin

85 - 92% copper and rest tin with little lead and nickel

13. An example of amorphous material is

Zinc

Glass

Lead

Silver

14. Nimonic contains __________ percentage of nickel as that of Inconel.

None of these

Same

Less

More

15. Melting point of iron is

1539°C

1712°C

1489°C

1601°C

16. Drop forging dies contain carbon of the order of

0.25 to 0.5%

0.6 to 0.7%

0.7 to 0.9%

0.1 to 0.2%

17. Steel made from phosphate iron is

Brittle

Hard

Tough

Ductile

18. Argentite is the principal ore or raw material for

Silver

Aluminium

Zinc

Tin

19. The machinability of steel is increased by

Phosphorous, lead and sulphur

Phosphorous and aluminium

Silicon and sulphur

Sulphur, graphite and aluminium

20. Manganese in steel increases its

Hardness

Ductility

Fluidity

Tensile strength

Page 3 of 4

21. Sulphur in cast iron

Make the iron white and hard

Increases hardness and brittleness

Makes the iron soft and easily machinable

Aids fusibility and fluidity

22. Beryllium bronze has

(D) None of these

(C) Both (A) and (B)

(B) High fatigue limit

(A) High yield point

23. The presence of sulphur in pig iron makes

It hard

The casting unsound

It easily machinable

It brittle

24. Perminvar alloy having constant permeability is an alloy of

Nickel, copper and iron

Iron, zinc and bismuth

Nickel, copper and zinc

Copper, nickel and antimony

25. Aluminium bronze contains aluminium and copper in the ratio of

50 : 50

10 : 90

60 : 40

40 : 60

26. Phosphor bronze contains

2.5% phosphorous

0.5% of phosphorous

1% phosphorous

None of the above

27. The hardness is the property of a material due to which it

Breaks with little permanent distortion

Can cut another metal

Can be rolled or hammered into thin sheets

Can be drawn into wires

28. Carbon in iron is an example of

Intermetallic compounds

All of the above

Substitutional solution

Interstitial solid solution

29. Cold rolled steel sheets contain carbon of the following order

0.1%

0.2%

0.6%

0.4%

30. Shock resisting steels should have

Low wear resistance

Low tensile strength

Toughness

Low hardness

Page 4 of 4

31. Free cutting steels

Do not exist

Are used where ease in machining is the criterion

Require least cutting force

Contain carbon in free form

32. Which is false statement about tempering? Tempering is done to

Improve toughness

Improve ductility

Release stresses

Improve machinability

33. Hardness of upper bainite (acicular structure) is about

RC 65

RC 48

RC 80

RC 57

34. Delta metal is an alloy of

Copper, zinc and iron

Iron, aluminium and magnesium

Iron, nickel and copper

Iron, lead and tin

35. The alloy used for making electrical resistances and heating elements is

Magnin

Nichrome

Invar

Elinvar

36. Which of the following is used for bearing liner?

Bell metal

Gun metal

Bronze

Babbitt metal

37. The crystal structure of brass is

Orthorhombic crystalline structure

H.C.P.

F.C.C.

B.C.C.

38. Corrosion resistance of steel is increased by adding

Chromium and nickel

Tungsten and sulphur

Nickel and molybdenum

Aluminium and zinc

39. Connecting rod is usually made of

High carbon steel

Low carbon steel

Medium carbon steel

Aluminium

40. Preheating is essential in welding

High speed steel

All nonferrous materials

All of the above

Cast iron

Engineering Materials Practice Set-8

Related

Leave a ReplyCancel reply

Secured Payments

Protection

Engineering Materials Practice Set-8

Share this Now with Friends:

Related

Leave a ReplyCancel reply

Secured Payments

Protection